drivers/power/supply/pcf50633-charger.c

   1 /* NXP PCF50633 Main Battery Charger Driver
   2  *
   3  * (C) 2006-2008 by Openmoko, Inc.
   4  * Author: Balaji Rao <balajirrao@openmoko.org>
   5  * All rights reserved.
   6  *
   7  * Broken down from monstrous PCF50633 driver mainly by
   8  * Harald Welte, Andy Green and Werner Almesberger
   9  *
  10  *  This program is free software; you can redistribute  it and/or modify it
  11  *  under  the terms of  the GNU General  Public License as published by the
  12  *  Free Software Foundation;  either version 2 of the  License, or (at your
  13  *  option) any later version.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/init.h>
  21 #include <linux/types.h>
  22 #include <linux/device.h>
  23 #include <linux/sysfs.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/power_supply.h>
  26
  27 #include <linux/mfd/pcf50633/core.h>
  28 #include <linux/mfd/pcf50633/mbc.h>
  29
  30 struct pcf50633_mbc {
  31         struct pcf50633 *pcf;
  32
  33         int adapter_online;
  34         int usb_online;
  35
  36         struct power_supply *usb;
  37         struct power_supply *adapter;
  38         struct power_supply *ac;
  39 };
  40
  41 int pcf50633_mbc_usb_curlim_set(struct pcf50633 *pcf, int ma)
  42 {
  43         struct pcf50633_mbc *mbc = platform_get_drvdata(pcf->mbc_pdev);
  44         int ret = 0;
  45         u8 bits;
  46         u8 mbcs2, chgmod;
  47         unsigned int mbcc5;
  48
  49         if (ma >= 1000) {
  50                 bits = PCF50633_MBCC7_USB_1000mA;
  51                 ma = 1000;
  52         } else if (ma >= 500) {
  53                 bits = PCF50633_MBCC7_USB_500mA;
  54                 ma = 500;
  55         } else if (ma >= 100) {
  56                 bits = PCF50633_MBCC7_USB_100mA;
  57                 ma = 100;
  58         } else {
  59                 bits = PCF50633_MBCC7_USB_SUSPEND;
  60                 ma = 0;
  61         }
  62
  63         ret = pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC7,
  64                                         PCF50633_MBCC7_USB_MASK, bits);
  65         if (ret)
  66                 dev_err(pcf->dev, "error setting usb curlim to %d mA\n", ma);
  67         else
  68                 dev_info(pcf->dev, "usb curlim to %d mA\n", ma);
  69
  70         /*
  71          * We limit the charging current to be the USB current limit.
  72          * The reason is that on pcf50633, when it enters PMU Standby mode,
  73          * which it does when the device goes "off", the USB current limit
  74          * reverts to the variant default.  In at least one common case, that
  75          * default is 500mA.  By setting the charging current to be the same
  76          * as the USB limit we set here before PMU standby, we enforce it only
  77          * using the correct amount of current even when the USB current limit
  78          * gets reset to the wrong thing
  79          */
  80
  81         if (mbc->pcf->pdata->charger_reference_current_ma) {
  82                 mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
  83                 if (mbcc5 > 255)
  84                         mbcc5 = 255;
  85                 pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
  86         }
  87
  88         mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
  89         chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
  90
  91         /* If chgmod == BATFULL, setting chgena has no effect.
  92          * Datasheet says we need to set resume instead but when autoresume is
  93          * used resume doesn't work. Clear and set chgena instead.
  94          */
  95         if (chgmod != PCF50633_MBCS2_MBC_BAT_FULL)
  96                 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
  97                                 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
  98         else {
  99                 pcf50633_reg_clear_bits(pcf, PCF50633_REG_MBCC1,
 100                                 PCF50633_MBCC1_CHGENA);
 101                 pcf50633_reg_set_bit_mask(pcf, PCF50633_REG_MBCC1,
 102                                 PCF50633_MBCC1_CHGENA, PCF50633_MBCC1_CHGENA);
 103         }
 104
 105         power_supply_changed(mbc->usb);
 106
 107         return ret;
 108 }
 109 EXPORT_SYMBOL_GPL(pcf50633_mbc_usb_curlim_set);
 110
 111 int pcf50633_mbc_get_status(struct pcf50633 *pcf)
 112 {
 113         struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
 114         int status = 0;
 115         u8 chgmod;
 116
 117         if (!mbc)
 118                 return 0;
 119
 120         chgmod = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2)
 121                 & PCF50633_MBCS2_MBC_MASK;
 122
 123         if (mbc->usb_online)
 124                 status |= PCF50633_MBC_USB_ONLINE;
 125         if (chgmod == PCF50633_MBCS2_MBC_USB_PRE ||
 126             chgmod == PCF50633_MBCS2_MBC_USB_PRE_WAIT ||
 127             chgmod == PCF50633_MBCS2_MBC_USB_FAST ||
 128             chgmod == PCF50633_MBCS2_MBC_USB_FAST_WAIT)
 129                 status |= PCF50633_MBC_USB_ACTIVE;
 130         if (mbc->adapter_online)
 131                 status |= PCF50633_MBC_ADAPTER_ONLINE;
 132         if (chgmod == PCF50633_MBCS2_MBC_ADP_PRE ||
 133             chgmod == PCF50633_MBCS2_MBC_ADP_PRE_WAIT ||
 134             chgmod == PCF50633_MBCS2_MBC_ADP_FAST ||
 135             chgmod == PCF50633_MBCS2_MBC_ADP_FAST_WAIT)
 136                 status |= PCF50633_MBC_ADAPTER_ACTIVE;
 137
 138         return status;
 139 }
 140 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_status);
 141
 142 int pcf50633_mbc_get_usb_online_status(struct pcf50633 *pcf)
 143 {
 144         struct pcf50633_mbc *mbc  = platform_get_drvdata(pcf->mbc_pdev);
 145
 146         if (!mbc)
 147                 return 0;
 148
 149         return mbc->usb_online;
 150 }
 151 EXPORT_SYMBOL_GPL(pcf50633_mbc_get_usb_online_status);
 152
 153 static ssize_t
 154 show_chgmode(struct device *dev, struct device_attribute *attr, char *buf)
 155 {
 156         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 157
 158         u8 mbcs2 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS2);
 159         u8 chgmod = (mbcs2 & PCF50633_MBCS2_MBC_MASK);
 160
 161         return sprintf(buf, "%d\n", chgmod);
 162 }
 163 static DEVICE_ATTR(chgmode, S_IRUGO, show_chgmode, NULL);
 164
 165 static ssize_t
 166 show_usblim(struct device *dev, struct device_attribute *attr, char *buf)
 167 {
 168         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 169         u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 170                                                 PCF50633_MBCC7_USB_MASK;
 171         unsigned int ma;
 172
 173         if (usblim == PCF50633_MBCC7_USB_1000mA)
 174                 ma = 1000;
 175         else if (usblim == PCF50633_MBCC7_USB_500mA)
 176                 ma = 500;
 177         else if (usblim == PCF50633_MBCC7_USB_100mA)
 178                 ma = 100;
 179         else
 180                 ma = 0;
 181
 182         return sprintf(buf, "%u\n", ma);
 183 }
 184
 185 static ssize_t set_usblim(struct device *dev,
 186                 struct device_attribute *attr, const char *buf, size_t count)
 187 {
 188         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 189         unsigned long ma;
 190         int ret;
 191
 192         ret = kstrtoul(buf, 10, &ma);
 193         if (ret)
 194                 return ret;
 195
 196         pcf50633_mbc_usb_curlim_set(mbc->pcf, ma);
 197
 198         return count;
 199 }
 200
 201 static DEVICE_ATTR(usb_curlim, S_IRUGO | S_IWUSR, show_usblim, set_usblim);
 202
 203 static ssize_t
 204 show_chglim(struct device *dev, struct device_attribute *attr, char *buf)
 205 {
 206         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 207         u8 mbcc5 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC5);
 208         unsigned int ma;
 209
 210         if (!mbc->pcf->pdata->charger_reference_current_ma)
 211                 return -ENODEV;
 212
 213         ma = (mbc->pcf->pdata->charger_reference_current_ma *  mbcc5) >> 8;
 214
 215         return sprintf(buf, "%u\n", ma);
 216 }
 217
 218 static ssize_t set_chglim(struct device *dev,
 219                 struct device_attribute *attr, const char *buf, size_t count)
 220 {
 221         struct pcf50633_mbc *mbc = dev_get_drvdata(dev);
 222         unsigned long ma;
 223         unsigned int mbcc5;
 224         int ret;
 225
 226         if (!mbc->pcf->pdata->charger_reference_current_ma)
 227                 return -ENODEV;
 228
 229         ret = kstrtoul(buf, 10, &ma);
 230         if (ret)
 231                 return ret;
 232
 233         mbcc5 = (ma << 8) / mbc->pcf->pdata->charger_reference_current_ma;
 234         if (mbcc5 > 255)
 235                 mbcc5 = 255;
 236         pcf50633_reg_write(mbc->pcf, PCF50633_REG_MBCC5, mbcc5);
 237
 238         return count;
 239 }
 240
 241 /*
 242  * This attribute allows to change MBC charging limit on the fly
 243  * independently of usb current limit. It also gets set automatically every
 244  * time usb current limit is changed.
 245  */
 246 static DEVICE_ATTR(chg_curlim, S_IRUGO | S_IWUSR, show_chglim, set_chglim);
 247
 248 static struct attribute *pcf50633_mbc_sysfs_entries[] = {
 249         &dev_attr_chgmode.attr,
 250         &dev_attr_usb_curlim.attr,
 251         &dev_attr_chg_curlim.attr,
 252         NULL,
 253 };
 254
 255 static const struct attribute_group mbc_attr_group = {
 256         .name   = NULL,                 /* put in device directory */
 257         .attrs  = pcf50633_mbc_sysfs_entries,
 258 };
 259
 260 static void
 261 pcf50633_mbc_irq_handler(int irq, void *data)
 262 {
 263         struct pcf50633_mbc *mbc = data;
 264
 265         /* USB */
 266         if (irq == PCF50633_IRQ_USBINS) {
 267                 mbc->usb_online = 1;
 268         } else if (irq == PCF50633_IRQ_USBREM) {
 269                 mbc->usb_online = 0;
 270                 pcf50633_mbc_usb_curlim_set(mbc->pcf, 0);
 271         }
 272
 273         /* Adapter */
 274         if (irq == PCF50633_IRQ_ADPINS)
 275                 mbc->adapter_online = 1;
 276         else if (irq == PCF50633_IRQ_ADPREM)
 277                 mbc->adapter_online = 0;
 278
 279         power_supply_changed(mbc->ac);
 280         power_supply_changed(mbc->usb);
 281         power_supply_changed(mbc->adapter);
 282
 283         if (mbc->pcf->pdata->mbc_event_callback)
 284                 mbc->pcf->pdata->mbc_event_callback(mbc->pcf, irq);
 285 }
 286
 287 static int adapter_get_property(struct power_supply *psy,
 288                         enum power_supply_property psp,
 289                         union power_supply_propval *val)
 290 {
 291         struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 292         int ret = 0;
 293
 294         switch (psp) {
 295         case POWER_SUPPLY_PROP_ONLINE:
 296                 val->intval =  mbc->adapter_online;
 297                 break;
 298         default:
 299                 ret = -EINVAL;
 300                 break;
 301         }
 302         return ret;
 303 }
 304
 305 static int usb_get_property(struct power_supply *psy,
 306                         enum power_supply_property psp,
 307                         union power_supply_propval *val)
 308 {
 309         struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 310         int ret = 0;
 311         u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 312                                                 PCF50633_MBCC7_USB_MASK;
 313
 314         switch (psp) {
 315         case POWER_SUPPLY_PROP_ONLINE:
 316                 val->intval = mbc->usb_online &&
 317                                 (usblim <= PCF50633_MBCC7_USB_500mA);
 318                 break;
 319         default:
 320                 ret = -EINVAL;
 321                 break;
 322         }
 323         return ret;
 324 }
 325
 326 static int ac_get_property(struct power_supply *psy,
 327                         enum power_supply_property psp,
 328                         union power_supply_propval *val)
 329 {
 330         struct pcf50633_mbc *mbc = power_supply_get_drvdata(psy);
 331         int ret = 0;
 332         u8 usblim = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCC7) &
 333                                                 PCF50633_MBCC7_USB_MASK;
 334
 335         switch (psp) {
 336         case POWER_SUPPLY_PROP_ONLINE:
 337                 val->intval = mbc->usb_online &&
 338                                 (usblim == PCF50633_MBCC7_USB_1000mA);
 339                 break;
 340         default:
 341                 ret = -EINVAL;
 342                 break;
 343         }
 344         return ret;
 345 }
 346
 347 static enum power_supply_property power_props[] = {
 348         POWER_SUPPLY_PROP_ONLINE,
 349 };
 350
 351 static const u8 mbc_irq_handlers[] = {
 352         PCF50633_IRQ_ADPINS,
 353         PCF50633_IRQ_ADPREM,
 354         PCF50633_IRQ_USBINS,
 355         PCF50633_IRQ_USBREM,
 356         PCF50633_IRQ_BATFULL,
 357         PCF50633_IRQ_CHGHALT,
 358         PCF50633_IRQ_THLIMON,
 359         PCF50633_IRQ_THLIMOFF,
 360         PCF50633_IRQ_USBLIMON,
 361         PCF50633_IRQ_USBLIMOFF,
 362         PCF50633_IRQ_LOWSYS,
 363         PCF50633_IRQ_LOWBAT,
 364 };
 365
 366 static const struct power_supply_desc pcf50633_mbc_adapter_desc = {
 367         .name           = "adapter",
 368         .type           = POWER_SUPPLY_TYPE_MAINS,
 369         .properties     = power_props,
 370         .num_properties = ARRAY_SIZE(power_props),
 371         .get_property   = &adapter_get_property,
 372 };
 373
 374 static const struct power_supply_desc pcf50633_mbc_usb_desc = {
 375         .name           = "usb",
 376         .type           = POWER_SUPPLY_TYPE_USB,
 377         .properties     = power_props,
 378         .num_properties = ARRAY_SIZE(power_props),
 379         .get_property   = usb_get_property,
 380 };
 381
 382 static const struct power_supply_desc pcf50633_mbc_ac_desc = {
 383         .name           = "ac",
 384         .type           = POWER_SUPPLY_TYPE_MAINS,
 385         .properties     = power_props,
 386         .num_properties = ARRAY_SIZE(power_props),
 387         .get_property   = ac_get_property,
 388 };
 389
 390 static int pcf50633_mbc_probe(struct platform_device *pdev)
 391 {
 392         struct power_supply_config psy_cfg = {};
 393         struct pcf50633_mbc *mbc;
 394         int i;
 395         u8 mbcs1;
 396
 397         mbc = devm_kzalloc(&pdev->dev, sizeof(*mbc), GFP_KERNEL);
 398         if (!mbc)
 399                 return -ENOMEM;
 400
 401         platform_set_drvdata(pdev, mbc);
 402         mbc->pcf = dev_to_pcf50633(pdev->dev.parent);
 403
 404         /* Set up IRQ handlers */
 405         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 406                 pcf50633_register_irq(mbc->pcf, mbc_irq_handlers[i],
 407                                         pcf50633_mbc_irq_handler, mbc);
 408
 409         psy_cfg.supplied_to             = mbc->pcf->pdata->batteries;
 410         psy_cfg.num_supplicants         = mbc->pcf->pdata->num_batteries;
 411         psy_cfg.drv_data                = mbc;
 412
 413         /* Create power supplies */
 414         mbc->adapter = power_supply_register(&pdev->dev,
 415                                              &pcf50633_mbc_adapter_desc,
 416                                              &psy_cfg);
 417         if (IS_ERR(mbc->adapter)) {
 418                 dev_err(mbc->pcf->dev, "failed to register adapter\n");
 419                 return PTR_ERR(mbc->adapter);
 420         }
 421
 422         mbc->usb = power_supply_register(&pdev->dev, &pcf50633_mbc_usb_desc,
 423                                          &psy_cfg);
 424         if (IS_ERR(mbc->usb)) {
 425                 dev_err(mbc->pcf->dev, "failed to register usb\n");
 426                 power_supply_unregister(mbc->adapter);
 427                 return PTR_ERR(mbc->usb);
 428         }
 429
 430         mbc->ac = power_supply_register(&pdev->dev, &pcf50633_mbc_ac_desc,
 431                                         &psy_cfg);
 432         if (IS_ERR(mbc->ac)) {
 433                 dev_err(mbc->pcf->dev, "failed to register ac\n");
 434                 power_supply_unregister(mbc->adapter);
 435                 power_supply_unregister(mbc->usb);
 436                 return PTR_ERR(mbc->ac);
 437         }
 438
 439         if (sysfs_create_group(&pdev->dev.kobj, &mbc_attr_group))
 440                 dev_err(mbc->pcf->dev, "failed to create sysfs entries\n");
 441
 442         mbcs1 = pcf50633_reg_read(mbc->pcf, PCF50633_REG_MBCS1);
 443         if (mbcs1 & PCF50633_MBCS1_USBPRES)
 444                 pcf50633_mbc_irq_handler(PCF50633_IRQ_USBINS, mbc);
 445         if (mbcs1 & PCF50633_MBCS1_ADAPTPRES)
 446                 pcf50633_mbc_irq_handler(PCF50633_IRQ_ADPINS, mbc);
 447
 448         return 0;
 449 }
 450
 451 static int pcf50633_mbc_remove(struct platform_device *pdev)
 452 {
 453         struct pcf50633_mbc *mbc = platform_get_drvdata(pdev);
 454         int i;
 455
 456         /* Remove IRQ handlers */
 457         for (i = 0; i < ARRAY_SIZE(mbc_irq_handlers); i++)
 458                 pcf50633_free_irq(mbc->pcf, mbc_irq_handlers[i]);
 459
 460         sysfs_remove_group(&pdev->dev.kobj, &mbc_attr_group);
 461         power_supply_unregister(mbc->usb);
 462         power_supply_unregister(mbc->adapter);
 463         power_supply_unregister(mbc->ac);
 464
 465         return 0;
 466 }
 467
 468 static struct platform_driver pcf50633_mbc_driver = {
 469         .driver = {
 470                 .name = "pcf50633-mbc",
 471         },
 472         .probe = pcf50633_mbc_probe,
 473         .remove = pcf50633_mbc_remove,
 474 };
 475
 476 module_platform_driver(pcf50633_mbc_driver);
 477
 478 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 479 MODULE_DESCRIPTION("PCF50633 mbc driver");
 480 MODULE_LICENSE("GPL");
 481 MODULE_ALIAS("platform:pcf50633-mbc");